Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska
Neocalanus cristatus feeding on phytoplankton and microzooplankton was measured in the coastal Gulf of Alaska during spring and early summer of 2001 and 2003. N. cristatus CV fed primarily on particles > 20 µm. Particles in the 5 - 20 µm size range were ingested in some experiments under non-bloo...
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2005
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fthighwire:oai:open-archive.highwire.org:plankt:fbi039v1 2023-05-15T18:48:48+02:00 Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska Liu, Hongbin Dagg, Michael J. Strom, Suzanne 2005-06-22 14:59:15.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/fbi039v1 https://doi.org/10.1093/plankt/fbi039 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/fbi039v1 http://dx.doi.org/10.1093/plankt/fbi039 Copyright (C) 2005, Oxford University Press Article TEXT 2005 fthighwire https://doi.org/10.1093/plankt/fbi039 2016-11-16T18:35:29Z Neocalanus cristatus feeding on phytoplankton and microzooplankton was measured in the coastal Gulf of Alaska during spring and early summer of 2001 and 2003. N. cristatus CV fed primarily on particles > 20 µm. Particles in the 5 - 20 µm size range were ingested in some experiments under non-bloom conditions but not under bloom conditions. Particles < 5 µm were not ingested but increased during incubations because N. cristatus consumed their microzooplanktonic predators. N. cristatus are sufficiently abundant in nature to induce such a cascade effect in situ . Microzooplankton provided more than 70% of the carbon ingested by N. cristatus under non-bloom conditions but only about 30% under bloom conditions. N. cristatus ingested about 2 times more carbon under bloom conditions (average 21.4 µg C cop-1 d-1) than under non-bloom conditions (average 10.0 µg C cop-1 d-1) but these rates were inadequate to meet nutritional demands for growth and metabolism, estimated to be between 40 and 140 µg C cop-1 d-1. We believe our ingestion rates are underestimates of in situ rates because (1) we are underestimating consumption rates of large particles, (2) we may not be including some very large particles that should be considered as diet items, and (3) we are not properly accounting for the ingestion of aggregates. The feeding behavior of N. cristatus , one of the most abundant copepods in the North Pacific Ocean, remains incompletely understood. Text Alaska Copepods HighWire Press (Stanford University) Gulf of Alaska Pacific Journal of Plankton Research 27 7 647 662 |
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Article Liu, Hongbin Dagg, Michael J. Strom, Suzanne Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska |
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Article |
description |
Neocalanus cristatus feeding on phytoplankton and microzooplankton was measured in the coastal Gulf of Alaska during spring and early summer of 2001 and 2003. N. cristatus CV fed primarily on particles > 20 µm. Particles in the 5 - 20 µm size range were ingested in some experiments under non-bloom conditions but not under bloom conditions. Particles < 5 µm were not ingested but increased during incubations because N. cristatus consumed their microzooplanktonic predators. N. cristatus are sufficiently abundant in nature to induce such a cascade effect in situ . Microzooplankton provided more than 70% of the carbon ingested by N. cristatus under non-bloom conditions but only about 30% under bloom conditions. N. cristatus ingested about 2 times more carbon under bloom conditions (average 21.4 µg C cop-1 d-1) than under non-bloom conditions (average 10.0 µg C cop-1 d-1) but these rates were inadequate to meet nutritional demands for growth and metabolism, estimated to be between 40 and 140 µg C cop-1 d-1. We believe our ingestion rates are underestimates of in situ rates because (1) we are underestimating consumption rates of large particles, (2) we may not be including some very large particles that should be considered as diet items, and (3) we are not properly accounting for the ingestion of aggregates. The feeding behavior of N. cristatus , one of the most abundant copepods in the North Pacific Ocean, remains incompletely understood. |
format |
Text |
author |
Liu, Hongbin Dagg, Michael J. Strom, Suzanne |
author_facet |
Liu, Hongbin Dagg, Michael J. Strom, Suzanne |
author_sort |
Liu, Hongbin |
title |
Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska |
title_short |
Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska |
title_full |
Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska |
title_fullStr |
Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska |
title_full_unstemmed |
Grazing by the calanoid copepod Neocalanus cristatus on the microbial foodweb in the coastal Gulf of Alaska |
title_sort |
grazing by the calanoid copepod neocalanus cristatus on the microbial foodweb in the coastal gulf of alaska |
publisher |
Oxford University Press |
publishDate |
2005 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/fbi039v1 https://doi.org/10.1093/plankt/fbi039 |
geographic |
Gulf of Alaska Pacific |
geographic_facet |
Gulf of Alaska Pacific |
genre |
Alaska Copepods |
genre_facet |
Alaska Copepods |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/fbi039v1 http://dx.doi.org/10.1093/plankt/fbi039 |
op_rights |
Copyright (C) 2005, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/fbi039 |
container_title |
Journal of Plankton Research |
container_volume |
27 |
container_issue |
7 |
container_start_page |
647 |
op_container_end_page |
662 |
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1766242093499416576 |